Answer :

The posterior scapular muscle that crosses the glenohumeral joint is the teres major.

The teres major is a thick yet flattened, rectangular muscle that runs from the medial lip of the humerus' intertubercular groove to the inferior posterior scapula. Together with the latissimus dorsi, it helps the humerus stretch, adduct, and internally rotate. The teres major is a muscle located in the upper limb. It connects to both the scapula and the humerus, making it one of the seven scapulohumeral muscles. It is a substantial, rather flattened muscle.

The Latin word teres, which means "rounded," is the source of the name of the teres major muscle, which sits above the latissimus dorsi muscle and assists in the extension and medial rotation of the humerus.

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